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<!doctype html><html lang=en class=no-js><head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1,shrink-to-fit=no"><meta name=generator content="Hugo 0.107.0"><link rel=alternate type=application/rss+xml href=https://alguidelines.dev/docs/navpatterns/patterns/queries/index.xml><meta name=robots content="index, follow"><link rel="shortcut icon" href=/favicons/favicon.ico><link rel=apple-touch-icon href=/favicons/apple-touch-icon-180x180.png sizes=180x180><link rel=icon type=image/png href=/favicons/favicon-16x16.png sizes=16x16><link rel=icon type=image/png href=/favicons/favicon-32x32.png sizes=32x32><link rel=icon type=image/png href=/favicons/android-36x36.png sizes=36x36><link rel=icon type=image/png href=/favicons/android-48x48.png sizes=48x48><link rel=icon type=image/png href=/favicons/android-72x72.png sizes=72x72><link rel=icon type=image/png href=/favicons/android-96x96.png sizes=96x96><link rel=icon type=image/png href=/favicons/android-144x144.png sizes=144x144><link rel=icon type=image/png href=/favicons/android-192x192.png sizes=192x192><title>Queries | alguidelines.dev - Business Central Design Patterns</title><meta name=description content="Expand to see NAV design patterns which use queries.
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<!doctype html><html lang=en class=no-js><head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1,shrink-to-fit=no"><meta name=generator content="Hugo 0.110.0"><link rel=alternate type=application/rss+xml href=https://alguidelines.dev/docs/navpatterns/patterns/queries/index.xml><meta name=robots content="index, follow"><link rel="shortcut icon" href=/favicons/favicon.ico><link rel=apple-touch-icon href=/favicons/apple-touch-icon-180x180.png sizes=180x180><link rel=icon type=image/png href=/favicons/favicon-16x16.png sizes=16x16><link rel=icon type=image/png href=/favicons/favicon-32x32.png sizes=32x32><link rel=icon type=image/png href=/favicons/android-36x36.png sizes=36x36><link rel=icon type=image/png href=/favicons/android-48x48.png sizes=48x48><link rel=icon type=image/png href=/favicons/android-72x72.png sizes=72x72><link rel=icon type=image/png href=/favicons/android-96x96.png sizes=96x96><link rel=icon type=image/png href=/favicons/android-144x144.png sizes=144x144><link rel=icon type=image/png href=/favicons/android-192x192.png sizes=192x192><title>Queries | alguidelines.dev - Business Central Design Patterns</title><meta name=description content="Expand to see NAV design patterns which use queries.
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<a href="https://github.com/microsoft/alguidelines/issues/new?title=Queries" class=td-page-meta--issue target=_blank rel=noopener><i class="fab fa-github fa-fw"></i> Create Issue</a>
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<a href=https://github.com/microsoft/alguidelines/issues/new class=td-page-meta--project-issue target=_blank rel=noopener><i class="fas fa-tasks fa-fw"></i> Create project issue</a></div><div class="taxonomy taxonomy-terms-cloud taxo-tags"><h5 class=taxonomy-title>Tag Cloud</h5><ul class=taxonomy-terms><li><a class=taxonomy-term href=https://alguidelines.dev/tags/al/ data-taxonomy-term=al><span class=taxonomy-label>AL</span><span class=taxonomy-count>36</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/api/ data-taxonomy-term=api><span class=taxonomy-label>API</span><span class=taxonomy-count>3</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/c/al/ data-taxonomy-term=c/al><span class=taxonomy-label>C/AL</span><span class=taxonomy-count>136</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/decoupling/ data-taxonomy-term=decoupling><span class=taxonomy-label>Decoupling</span><span class=taxonomy-count>2</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/extendability/ data-taxonomy-term=extendability><span class=taxonomy-label>Extendability</span><span class=taxonomy-count>3</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/interface/ data-taxonomy-term=interface><span class=taxonomy-label>Interface</span><span class=taxonomy-count>2</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/performance/ data-taxonomy-term=performance><span class=taxonomy-label>Performance</span><span class=taxonomy-count>2</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/productivity/ data-taxonomy-term=productivity><span class=taxonomy-label>Productivity</span><span class=taxonomy-count>1</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/readability/ data-taxonomy-term=readability><span class=taxonomy-label>Readability</span><span class=taxonomy-count>55</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/telemetry/ data-taxonomy-term=telemetry><span class=taxonomy-label>Telemetry</span><span class=taxonomy-count>1</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/tags/testability/ data-taxonomy-term=testability><span class=taxonomy-label>Testability</span><span class=taxonomy-count>2</span></a></li></ul></div><div class="taxonomy taxonomy-terms-cloud taxo-categories"><h5 class=taxonomy-title>Categories</h5><ul class=taxonomy-terms><li><a class=taxonomy-term href=https://alguidelines.dev/categories/best-practice/ data-taxonomy-term=best-practice><span class=taxonomy-label>Best Practice</span><span class=taxonomy-count>90</span></a></li><li><a class=taxonomy-term href=https://alguidelines.dev/categories/pattern/ data-taxonomy-term=pattern><span class=taxonomy-label>Pattern</span><span class=taxonomy-count>73</span></a></li></ul></div></aside><main class="col-12 col-md-9 col-xl-8 pl-md-5" role=main><nav aria-label=breadcrumb class=td-breadcrumbs><ol class=breadcrumb><li class=breadcrumb-item><a href=https://alguidelines.dev/docs/>Docs</a></li><li class=breadcrumb-item><a href=https://alguidelines.dev/docs/navpatterns/>NAV Patterns Archive</a></li><li class=breadcrumb-item><a href=https://alguidelines.dev/docs/navpatterns/patterns/>1. Patterns</a></li><li class="breadcrumb-item active" aria-current=page><a href=https://alguidelines.dev/docs/navpatterns/patterns/queries/>Queries</a></li></ol></nav><div class=td-content><h1>Queries</h1><header class=article-meta><div class="taxonomy taxonomy-terms-article taxo-tags"><h5 class=taxonomy-title>Tags:</h5><ul class=taxonomy-terms><li><a class=taxonomy-term href=https://alguidelines.dev/tags/c/al/ data-taxonomy-term=c/al><span class=taxonomy-label>C/AL</span></a></li></ul></div><div class="taxonomy taxonomy-terms-article taxo-categories"><h5 class=taxonomy-title>Categories:</h5><ul class=taxonomy-terms><li><a class=taxonomy-term href=https://alguidelines.dev/categories/pattern/ data-taxonomy-term=pattern><span class=taxonomy-label>Pattern</span></a></li></ul></div></header><p>Expand to see NAV design patterns which use queries.</p><div class=section-index><hr class=panel-line><div class=entry><h5><a href=/docs/navpatterns/patterns/queries/select-distinct-with-queries/>SELECT DISTINCT with Queries</a></h5><p></p></div><div class=entry><h5><a href=/docs/navpatterns/patterns/queries/use-queries-to-detect-duplicate-records/>Use Queries to Detect Duplicate Records</a></h5><p></p></div><div class=entry><h5><a href=/docs/navpatterns/patterns/queries/use-queries-to-replace-nested-loops/>Use Queries to Replace Nested Loops</a></h5><p></p></div></div><div class="text-muted mt-5 pt-3 border-top">Last modified February 24, 2022: <a href=https://github.com/microsoft/alguidelines/commit/5ee0436639455a35835c5ce88241d3fad662ee06>Added tags & categories + cleanup (5ee04366)</a>
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<!doctype html><html lang=en class=no-js><head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1,shrink-to-fit=no"><meta name=generator content="Hugo 0.107.0"><meta name=robots content="index, follow"><link rel="shortcut icon" href=/favicons/favicon.ico><link rel=apple-touch-icon href=/favicons/apple-touch-icon-180x180.png sizes=180x180><link rel=icon type=image/png href=/favicons/favicon-16x16.png sizes=16x16><link rel=icon type=image/png href=/favicons/favicon-32x32.png sizes=32x32><link rel=icon type=image/png href=/favicons/android-36x36.png sizes=36x36><link rel=icon type=image/png href=/favicons/android-48x48.png sizes=48x48><link rel=icon type=image/png href=/favicons/android-72x72.png sizes=72x72><link rel=icon type=image/png href=/favicons/android-96x96.png sizes=96x96><link rel=icon type=image/png href=/favicons/android-144x144.png sizes=144x144><link rel=icon type=image/png href=/favicons/android-192x192.png sizes=192x192><title>Use Queries to Detect Duplicate Records | alguidelines.dev - Business Central Design Patterns</title><meta name=description content="Originally by Abshishek Ghosh and Bogdan Sturzoiu at Microsoft Development Center Copenhagen
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<!doctype html><html lang=en class=no-js><head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1,shrink-to-fit=no"><meta name=generator content="Hugo 0.110.0"><meta name=robots content="index, follow"><link rel="shortcut icon" href=/favicons/favicon.ico><link rel=apple-touch-icon href=/favicons/apple-touch-icon-180x180.png sizes=180x180><link rel=icon type=image/png href=/favicons/favicon-16x16.png sizes=16x16><link rel=icon type=image/png href=/favicons/favicon-32x32.png sizes=32x32><link rel=icon type=image/png href=/favicons/android-36x36.png sizes=36x36><link rel=icon type=image/png href=/favicons/android-48x48.png sizes=48x48><link rel=icon type=image/png href=/favicons/android-72x72.png sizes=72x72><link rel=icon type=image/png href=/favicons/android-96x96.png sizes=96x96><link rel=icon type=image/png href=/favicons/android-144x144.png sizes=144x144><link rel=icon type=image/png href=/favicons/android-192x192.png sizes=192x192><title>Use Queries to Detect Duplicate Records | alguidelines.dev - Business Central Design Patterns</title><meta name=description content="Originally by Abshishek Ghosh and Bogdan Sturzoiu at Microsoft Development Center Copenhagen
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Abstract
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This pattern uses queries to create an efficient …"><meta property="og:title" content="Use Queries to Detect Duplicate Records"><meta property="og:description" content="Originally by Abshishek Ghosh and Bogdan Sturzoiu at Microsoft Development Center Copenhagen
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Abstract This pattern uses queries to create an efficient way to detect duplicate entries in a table. This is, for example, useful when trying to find out which customers or contacts have the same names, so we can merge them later.
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</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>EXIT</span><span style=color:#ce5c00;font-weight:700>(</span>CustomerDuplicate<span style=color:#ce5c00;font-weight:700>.</span>READ<span style=color:#ce5c00;font-weight:700>)</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
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</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline></span><span style=color:#204a87;font-weight:700>END</span><span style=color:#000;font-weight:700>;</span><span style=color:#f8f8f8;text-decoration:underline>
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</span></span></span></code></pre></div><p><strong>Examples</strong></p><ul><li><strong>Acc. Sched. Chart Management</strong> codeunit (762),<br>methods CheckDuplicateAccScheduleLineDescription and CheckDuplicateColumnLayoutColumnHeader</li><li><strong>Analysis Report Chart Mgt.</strong> codeunit (770),<br>methods CheckDuplicateAnalysisLineDescription and CheckDuplicateAnalysisColumnHeader</li></ul><h2 id=consequences><strong>Consequences</strong></h2><p>A new query object is needed for every type of duplicate check. This could easily explode and create a maintenance problem.</p><div class="text-muted mt-5 pt-3 border-top">Last modified February 24, 2022: <a href=https://github.com/microsoft/alguidelines/commit/5ee0436639455a35835c5ce88241d3fad662ee06>Added tags & categories + cleanup (5ee04366)</a>
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by waldo1001</div></div></main></div></div><footer class="bg-dark py-5 row d-print-none"><div class="container-fluid mx-sm-5"><div class=row><div class="col-6 col-sm-4 text-xs-center order-sm-2"><ul class="list-inline mb-0"><li class="list-inline-item mx-2 h3" data-toggle=tooltip data-placement=top title=GitHub aria-label=GitHub><a class=text-white target=_blank rel=noopener href=https://github.com/microsoft/alguidelines aria-label=GitHub><i class="fab fa-github"></i></a></li><li class="list-inline-item mx-2 h3" data-toggle=tooltip data-placement=top title=Twitter aria-label=Twitter><a class=text-white target=_blank rel=noopener href="https://twitter.com/search?q=%23bcalhelp" aria-label=Twitter><i class="fab fa-twitter"></i></a></li><li class="list-inline-item mx-2 h3" data-toggle=tooltip data-placement=top title=Discord aria-label=Discord><a class=text-white target=_blank rel=noopener href=https://discord.gg/4wbfNv3 aria-label=Discord><i class="fab fa-discord"></i></a></li></ul></div><div class="col-6 col-sm-4 text-right text-xs-center order-sm-3"></div><div class="col-12 col-sm-4 text-center py-2 order-sm-2"><small class=text-white>© 2022 alguidelines.dev Project All Rights Reserved</small></div></div></div></footer></div><script src=https://cdn.jsdelivr.net/npm/popper.js@1.16.1/dist/umd/popper.min.js integrity=sha384-9/reFTGAW83EW2RDu2S0VKaIzap3H66lZH81PoYlFhbGU+6BZp6G7niu735Sk7lN crossorigin=anonymous></script>
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by waldo1001</div></div></main></div></div><footer class="bg-dark py-5 row d-print-none"><div class="container-fluid mx-sm-5"><div class=row><div class="col-6 col-sm-4 text-xs-center order-sm-2"><ul class="list-inline mb-0"><li class="list-inline-item mx-2 h3" data-toggle=tooltip data-placement=top title=GitHub aria-label=GitHub><a class=text-white target=_blank rel=noopener href=https://github.com/microsoft/alguidelines aria-label=GitHub><i class="fab fa-github"></i></a></li><li class="list-inline-item mx-2 h3" data-toggle=tooltip data-placement=top title=Twitter aria-label=Twitter><a class=text-white target=_blank rel=noopener href="https://twitter.com/search?q=%23bcalhelp" aria-label=Twitter><i class="fab fa-twitter"></i></a></li><li class="list-inline-item mx-2 h3" data-toggle=tooltip data-placement=top title=Discord aria-label=Discord><a class=text-white target=_blank rel=noopener href=https://discord.gg/4wbfNv3 aria-label=Discord><i class="fab fa-discord"></i></a></li></ul></div><div class="col-6 col-sm-4 text-right text-xs-center order-sm-3"></div><div class="col-12 col-sm-4 text-center py-2 order-sm-2"><small class=text-white>© 2023 alguidelines.dev Project All Rights Reserved</small></div></div></div></footer></div><script src=https://cdn.jsdelivr.net/npm/popper.js@1.16.1/dist/umd/popper.min.js integrity=sha384-9/reFTGAW83EW2RDu2S0VKaIzap3H66lZH81PoYlFhbGU+6BZp6G7niu735Sk7lN crossorigin=anonymous></script>
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<!doctype html><html lang=en class=no-js><head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1,shrink-to-fit=no"><meta name=generator content="Hugo 0.107.0"><meta name=robots content="index, follow"><link rel="shortcut icon" href=/favicons/favicon.ico><link rel=apple-touch-icon href=/favicons/apple-touch-icon-180x180.png sizes=180x180><link rel=icon type=image/png href=/favicons/favicon-16x16.png sizes=16x16><link rel=icon type=image/png href=/favicons/favicon-32x32.png sizes=32x32><link rel=icon type=image/png href=/favicons/android-36x36.png sizes=36x36><link rel=icon type=image/png href=/favicons/android-48x48.png sizes=48x48><link rel=icon type=image/png href=/favicons/android-72x72.png sizes=72x72><link rel=icon type=image/png href=/favicons/android-96x96.png sizes=96x96><link rel=icon type=image/png href=/favicons/android-144x144.png sizes=144x144><link rel=icon type=image/png href=/favicons/android-192x192.png sizes=192x192><title>Use Queries to Replace Nested Loops | alguidelines.dev - Business Central Design Patterns</title><meta name=description content="Originally by Bogdan Sturzoiu, Microsoft Development Center Copenhagen
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<!doctype html><html lang=en class=no-js><head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1,shrink-to-fit=no"><meta name=generator content="Hugo 0.110.0"><meta name=robots content="index, follow"><link rel="shortcut icon" href=/favicons/favicon.ico><link rel=apple-touch-icon href=/favicons/apple-touch-icon-180x180.png sizes=180x180><link rel=icon type=image/png href=/favicons/favicon-16x16.png sizes=16x16><link rel=icon type=image/png href=/favicons/favicon-32x32.png sizes=32x32><link rel=icon type=image/png href=/favicons/android-36x36.png sizes=36x36><link rel=icon type=image/png href=/favicons/android-48x48.png sizes=48x48><link rel=icon type=image/png href=/favicons/android-72x72.png sizes=72x72><link rel=icon type=image/png href=/favicons/android-96x96.png sizes=96x96><link rel=icon type=image/png href=/favicons/android-144x144.png sizes=144x144><link rel=icon type=image/png href=/favicons/android-192x192.png sizes=192x192><title>Use Queries to Replace Nested Loops | alguidelines.dev - Business Central Design Patterns</title><meta name=description content="Originally by Bogdan Sturzoiu, Microsoft Development Center Copenhagen
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Abstract
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This pattern shows how the new query object type introduced in NAV …"><meta property="og:title" content="Use Queries to Replace Nested Loops"><meta property="og:description" content="Originally by Bogdan Sturzoiu, Microsoft Development Center Copenhagen
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Abstract This pattern shows how the new query object type introduced in NAV 2013 allows you to replace costly loops when inspecting data from two or more tables.
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@ -118,7 +118,7 @@ Description One of the core operations in a relational database is joining two o
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</span></span></span><span style=display:flex><span><span style=color:#f8f8f8;text-decoration:underline> </span><span style=color:#204a87;font-weight:700>END</span><span style=color:#ce5c00;font-weight:700>.
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</span></span></span><span style=display:flex><span><span style=color:#ce5c00;font-weight:700> </span>}<span style=color:#f8f8f8;text-decoration:underline>
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</span></span></span></code></pre></div><p>When comparing the two implementations, we notice the following advantages of using a query instead of two loops:Comparison</p><ol><li>A query produces the Cartesian product of tables 1 and 2 faster than by looping through both of them. The advantage grows as there are more tables linked.</li></ol><p>The query object leverages the power of SQL Server (as it basically executes a SQL query directly against the database server), and as such it only requires one trip to the database to fetch the data, instead of getting the related records on the right side of the join one by one.</p><ol><li>A query is scalable in the sense that it allows reusing its definition by applying filters when looping through its dataset. So a generic query can be reused for a variety of purposes just by adapting the filters to the programming need. Duplicating traditional record loops in different functions, on the other side, requires extensive code copy-pasting, which can introduce code defects.</li><li>Using a query only requires one loop, whereas joining two or more tables requires multiple code loops that quickly become difficult to read and follow.</li><li>Queries are easy to create and maintain and generally provide a cleaner design.</li></ol><h3 id=nav-specific-examples>NAV Specific Examples</h3><p>In Microsoft Dynamics NAV 2013 R2, we can see the query object used in the bank account reconciliation matching algorithm. The object is query Bank Rec. Match Candidates query (1252), and it is called by the matching engine in the Match Bank Rec. Lines codeunit (1252).</p><h3 id=ideas-for-improvement>Ideas for Improvement</h3><p>The query object type could be improved to allow the passing of parameters at runtime, or, in general, being built dynamically at runtime. This will remove the need for multiple static definitions of the same base query used in slightly different contexts.</p><div class="text-muted mt-5 pt-3 border-top">Last modified February 24, 2022: <a href=https://github.com/microsoft/alguidelines/commit/5ee0436639455a35835c5ce88241d3fad662ee06>Added tags & categories + cleanup (5ee04366)</a>
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